Rapid and accurate determination of total lung capacity (TLC) from routine chest radiograms using a programmable hand-held calculator

Rodgers, R.P. Channing; Tannen, Richard

doi:10.1016/s0010-4825(83)80004-3

Cited by 5 publications

(2 citation statements)

References 10 publications

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“…(4) Rib cage volume differences between structurally normal and deformed scoliotic spines. The calculated rib cage volume of 8.14 1 is in agreement with the reported literature on total thoracic volume (Rodgers and Tannen, 1983). Our initial studies found that although the total rib cage volume changes little, the volume distribution becomes asymmetric.…”

Section: And Anterior1supporting

confidence: 89%

A model for studies of the deformable rib cage

Closkey¹,

Schultz²,

Luchies³

1992

Journal of Biomechanics

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An earlier model for the study of rib cage mechanics was modified so that rib deformity in scoliosis could be better represented. The rigid ribs of that model were replaced by five-segment deformable ribs. Literature data on cadaver rib mechanical behavior were used to assign stiffnesses to the new individual model ribs so that experimental and model rib deflections agreed. Shear and tension/compression stiffnesses had little effect on individual rib deformation, but bending stiffnesses had a major effect. Level-to-level differences in mechanical behavior could be explained almost exclusively by level to level differences in the rib shape. The model ribs were then assembled into a whole rib cage. Computer simulations of whole rib cage behaviors, both in vivo and in vitro, showed a reasonable agreement with the measured behaviors. The model was used to study rib cage mechanics in two scolioses, one with a 43 degrees and the other with a 70 degrees Cobb angle. Scoliotic rib cage deformities were quantified by parameters measuring the rib cage lateral offset, rib cage axial rotation, rib cage volume and rib distortion. Rib distortion was quantified both in best-fit and simulated computer tomography (CT) scan planes. Model rib distortion was much smaller in best-fit planes than in CT planes. The total rib cage volume changed little in the presence of the scolioses, but it became asymmetrically distributed.

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Section: And Anterior1supporting

confidence: 89%

A model for studies of the deformable rib cage

Closkey¹,

Schultz²,

Luchies³

1992

Journal of Biomechanics

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“…It considers the thorax to be a stack of five elliptical sections that allow an estimation of the lung volume by integration from measures of transverse diameters and heights in anteroposterior and lateral chest x-rays. Although the Barnhard-Loyd radiographic method appears to be as accurate as pletysmography, it does not seem to have gained wide use, probably because it is a lengthy process requiring as much as 30 minutes for the determination of total lung capacity (Rodgers and Tannen, 1983). The use of this method in small animals is limited by the size of the lungs, and the idea of correlate lung volume with chest xrays appears to be superior.…”

Section: Introductionmentioning

confidence: 99%

A radiographic method to estimate lung volume and its use in small mammals

2005

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In this paper we develop a method to estimate lung volume using chest x-rays of small mammals. We applied this method to assess the lung volume of several rodents. We showed that a good estimator of the lung volume is: V * L = 0.496 · V RX ≈1/2·V RX , where V RX is a measurement obtained from the x-ray that represents the volume of a rectangular box containing the lungs and mediastinum organs. The proposed formula may be interpreted as the volume of an ellipsoid formed by both lungs joined at their bases. When that relationship was used to estimate lung volume, values similar to those expected from allometric relationship were found in four rodents. In two others, M. musculus and R. norvegicus, lung volume was similar to reported data, although values were lower than expected.

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Computer Applications in Pulmonary Function Testing

Heitz¹

1985

Computers in Critical Care and Pulmonary Medicine

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Rapid and accurate determination of total lung capacity (TLC) from routine chest radiograms using a programmable hand-held calculator

Cited by 5 publications

References 10 publications

A model for studies of the deformable rib cage

A model for studies of the deformable rib cage

A radiographic method to estimate lung volume and its use in small mammals

Computer Applications in Pulmonary Function Testing

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